In Britain, less than three wheels makes it a motorcycle, because like ryguy said, less regs. I wanna say some four-wheeled cars like the Ariel Atom and BAC Mono are classified as motorcycles too, but I'm honestly not sure.

Turbojett wrote:In Britain, less than three wheels makes it a motorcycle, because like ryguy said, less regs. I wanna say some four-wheeled cars like the Ariel Atom and BAC Mono are classified as motorcycles too, but I'm honestly not sure.

I recall from Top Gear's constant attacks (including the literal RC car-bomb attack) that the G-Whiz was considered a quad cycle to get around regs.